The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2020
Filed:
Aug. 16, 2016
Robert Bosch Gmbh, Stuttgart, DE;
Alexander Boronka, Shanghai, CN;
Xiaoyun Zang, Shanghai, CN;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An optical sensor for estimating positions of rotors in a motor comprises an optical source () and a plurality of photo detectors (), the motor further has stators and is used for e-machines, the optical source () is mounted on the surface of the rotor where the air gap is big enough to not block magnetic flux between the rotors and the stators, the photo detectors () are arranged evenly around the stator tooth slots and configured to detect light emitted by the optical source () and output parameters which are used to estimate the positions of rotors. The proposed low cost optical sensor measures the angular position of rotating e-machine when sensorless control algorithm is applied but limited by response time at high speed region. The optical sensor only adds small cost and provides rotor position information with enough accuracy for FOC control at high rotational speed. A method for estimating positions of rotors in a motor and a motor comprising the optical sensor are also provided.